34 Hour Reset Calculator

34-Hour Reset Calculator

Determine exactly when your 70-hour clock resets for HOS compliance.

Ready to Return On:

function calculateReset() { var dateInput = document.getElementById('lastDutyDate').value; var timeInput = document.getElementById('lastDutyTime').value; var resultDiv = document.getElementById('resetResult'); var returnDisplay = document.getElementById('returnTimestamp'); var remainingDisplay = document.getElementById('timeRemaining'); if (!dateInput || !timeInput) { alert('Please select both a date and time.'); return; } var lastDuty = new Date(dateInput + 'T' + timeInput); if (isNaN(lastDuty.getTime())) { alert('Invalid date or time format.'); return; } // Add 34 hours in milliseconds (34 * 60 * 60 * 1000) var resetTime = new Date(lastDuty.getTime() + (34 * 60 * 60 * 1000)); var options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric', hour: '2-digit', minute: '2-digit' }; var formattedDate = resetTime.toLocaleDateString(undefined, options); returnDisplay.innerHTML = formattedDate; resultDiv.style.display = 'block'; // Calculate time until reset from current moment var now = new Date(); var diffMs = resetTime – now; if (diffMs > 0) { var diffHrs = Math.floor(diffMs / (1000 * 60 * 60)); var diffMins = Math.floor((diffMs % (1000 * 60 * 60)) / (1000 * 60)); remainingDisplay.innerHTML = "Time remaining until reset: " + diffHrs + " hours and " + diffMins + " minutes."; } else { remainingDisplay.innerHTML = "You have completed your 34-hour reset and are clear to drive!"; remainingDisplay.style.color = "#5cb85c"; } }

Understanding the 34-Hour Reset Rule

The 34-hour reset is a critical component of the Federal Motor Carrier Safety Administration (FMCSA) Hours of Service (HOS) regulations. This rule allows commercial motor vehicle (CMV) drivers to "restart" their 60-hour or 70-hour weekly on-duty limits by taking a continuous period of at least 34 consecutive hours off-duty or in the sleeper berth.

How the 34-Hour Reset Works

Truck drivers are limited to a certain number of hours they can work in a 7 or 8-day consecutive period. Once a driver hits the 70-hour limit within 8 days (for most long-haul carriers), they can no longer drive until they have "rolled off" enough hours from previous days. However, the 34-hour reset provides a shortcut. By staying off-duty for 34 hours, the driver can return to work with a fresh 70-hour clock immediately.

Compliance Requirements

  • Consecutive Hours: The 34 hours must be consecutive. If a driver logs even one minute of "On-Duty" time during this period, the clock restarts.
  • Logging: The time must be spent in "Off-Duty" status or "Sleeper Berth" status.
  • Electronic Logging Devices (ELD): Modern ELDs automatically detect and calculate the reset, but drivers often use a 34-hour reset calculator to plan their routes and downtime in advance.

Calculation Example

If a driver finishes their last shift and goes off-duty on Friday at 6:00 PM, they must remain off-duty for exactly 34 hours.

– 6:00 PM Friday to 6:00 PM Saturday = 24 hours.
– 6:00 PM Saturday + 10 additional hours = 4:00 AM Sunday.

In this scenario, the driver is eligible to start their new work week on Sunday at 4:00 AM.

Why Use a 34-Hour Reset Calculator?

Precision is vital in the trucking industry. Logbook violations can lead to heavy fines, lower CSA (Compliance, Safety, Accountability) scores, and "out-of-service" orders. Using a digital calculator eliminates human error in manual math, ensuring that when you hit the road again, you are fully compliant with federal safety standards.

Common Misconceptions

Previously, there were restrictions requiring the 34-hour reset to include two periods between 1:00 AM and 5:00 AM, and a limit of one reset per week. These restrictions are no longer in effect. Under current FMCSA rules, a driver can take as many resets as needed, and the 34-hour period can occur at any time of day or night.

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